Quote:
Originally Posted by Sev
it's a proven fact that you get better airflow with a K&N filter than the stock air filter. anyone who disagrees just doesn't want to believe the science
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Yes, but the big factor is that the stock air filter already provides more air than the engine needs, especially on the older engines. Think of it this way, I have a cup I want to fill with water, only so much water can get into the cup. One one hand, I use a pitcher to fill the cup, on the other, I use a barrel to fill the cup. Either way, the cup can only hold so much water and exactly the same result is achieved. The size and volume of the pitcher and barrel have no relevance on the set in stone size and volume of the cup.
When people put an ebay "cold air intake" on their diesel, the only difference in performance that is realized is a nice audible turbo whine, otherwise the engine is taking in the same amount of air. I did this, apart from the turbo whine, the engine was no different.
Its not a matter of the K&N providing more airflow and thus more power, its a matter of the K&N doing nothing substantially more since the engine already gets far more air flow than needed from the stock setup. Thats why its not a great mod alone on a stock engine, regardless of the flow differences between paper and K&N gauze and whether or not you think one is damaging.
I have one of those round K&N OEM replacement filters on my 240 now, which came with the car, but I am switching back to paper since I think its just a pain to clean out the gauze filter. Id rather just slam in a paper element in the 40 seconds it takes to unbolt one bolt and pop 4 clasps.